WTRU Mobility via Anchor Carrier Segmentation
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Solution Overview
Problem
Current dual-cell operation in wireless communication systems, particularly in WCDMA, is limited by restrictions on mobility procedures when dealing with non-adjacent frequencies or across frequency bands, necessitating improved methods for cell search, reselection, measurement reporting, and handovers.
Innovation Solution
The implementation of enhanced Wireless Transmit Receive Units (WTRUs) configured to perform optimized mobility procedures, including cell search, measurement reporting, and inter-frequency handovers, using carrier priority mechanisms and advanced receiver configurations to manage dual-cell operations across multiple carriers and frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual-cell operation is expanded to non-adjacent frequencies or across frequency bands, then system capacity and throughput are improved, but mobility procedures and handover management become more complex
Solution Approach 1:
The patent segments mobility management by introducing separate anchor carrier and supplementary carrier roles. The anchor carrier handles control plane functions and mobility procedures, while supplementary carriers focus on data transmission. This segmentation allows dual-cell operation on non-adjacent frequencies without complicating mobility management, as the anchor carrier maintains standardized handover procedures.
Solution Approach 2:
The patent introduces the anchor carrier as an intermediary that mediates between the WTRU and the network for control plane operations. All mobility procedures, measurement reporting, and handover decisions are anchored to this carrier, which acts as a stable reference point even when supplementary carriers change. This intermediary approach simplifies mobility management across frequency bands.
2Productivity
If dual-cell operation uses non-adjacent carriers, then load balancing and capacity gain are improved, but measurement reporting and cell reselection procedures are impacted
Solution Approach 1:
The patent applies local quality by assigning different functional characteristics to different carriers. The anchor carrier is optimized for control plane operations and mobility management, while supplementary carriers are optimized for data transmission. This allows measurement reporting to focus on the anchor carrier for mobility decisions, while supplementary carriers provide capacity without requiring complex inter-frequency measurement procedures.
3Ease of operation
If supplementary carrier is restricted to adjacent frequency, then pathloss between cells is similar and mobility procedures are simplified, but system versatility and future expansion are limited
Solution Approach 1:
The patent introduces dynamic carrier configuration where the anchor carrier and supplementary carrier relationship can be flexibly established and modified. The system dynamically assigns carriers based on network conditions, WTRU capabilities, and service requirements. This allows the system to adapt to both adjacent and non-adjacent frequency scenarios, providing versatility while maintaining simplified mobility procedures through the anchor carrier concept.
Data Source
AI summary
Dual-cell or multi-cell Wireless Transmit Receive Units (WTRUs) configured to implement mobility procedures are described. The WTRU configurations implement methods to optimize and allow mobility for the procedures of cell search and cell reselection, measurement reporting and inter-frequency handovers, compressed mode measurements, and soft handovers.